waveguide technology. Waveguides are hollow metal tubes inside which an
electromagnetic wave may be transmitted. Filters are a basic component
of electronic engineering designs and have numerous applications.
Waveguide filters are most useful in the microwave band of frequencies,
where they are a convenient size and have low loss. Examples are found
in satellite communications, telephone networks, and television
broadcasting. Waveguide filters were developed during World War II for
radar and electronic countermeasures, but afterwards soon found civilian
applications. Post-war development was concerned with reducing size,
first with new analysis techniques that eliminated unnecessary
components, then by innovations such as dual-mode cavities and ceramic
resonators. Waveguides can support a variety of electromagnetic wave
modes: both a disadvantage, spurious modes frequently cause problems,
and an advantage; dual-mode designs can be much smaller. The chief
advantages of waveguide filters are ability to handle high power and low
loss. The chief disadvantages are bulk and cost compared to technologies
like microstrip.
Read more: <https://en.wikipedia.org/wiki/Waveguide_filter>
_______________________________
Today's selected anniversaries:
9:
The Western Han Dynasty of China ended after the throne was
usurped by Wang Mang (pictured), who founded the Xin Dynasty.
<https://en.wikipedia.org/wiki/Han_Dynasty>
236:
Pope Fabian, who is said to have been chosen by the Holy Spirit
by having a dove land on his head, began his papacy.
<https://en.wikipedia.org/wiki/Pope_Fabian>
1863:
Service began on the Metropolitan Railway between Paddington
and Farringdon Street, today the oldest segment of the London
Underground.
<https://en.wikipedia.org/wiki/Metropolitan_Railway>
1929:
The Adventures of Tintin, a series of popular comic books
created by Belgian artist Hergé, first appeared in a children's
supplement to the Belgian newspaper Le Vingtième Siècle.
<https://en.wikipedia.org/wiki/The_Adventures_of_Tintin>
1954:
BOAC Flight 781 suffered an explosive decompression at altitude
and crashed into the Mediterranean Sea, killing everyone on board.
<https://en.wikipedia.org/wiki/BOAC_Flight_781>
_____________________________
Wiktionary's word of the day:
zeptomole:
(chemistry, physics) A small amount of a substance, especially a
countable number of atoms or molecules.
<https://en.wiktionary.org/wiki/zeptomole>
___________________________
Wikiquote quote of the day:
I think, here is your emblem To hang in the future sky; Not the
cross, not the hive, But this; bright power, dark peace; Fierce
consciousness joined with final Disinterestedness; Life with calm death;
the falcon's Realist eyes and act Married to the massive Mysticism of
stone, Which failure cannot cast down Nor success make proud.
--Robinson Jeffers
<https://en.wikiquote.org/wiki/Robinson_Jeffers>
_______________________________________________
Wikipedia Daily Article mailing list.
To unsubscribe, visit:
https://lists.wikimedia.org/mailman/listinfo/daily-article-l
Questions or comments? Contact dal-feedback@wikimedia.org